Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, an RFID-RC522 module, a pushbutton, a buzzer, and an LCD 20x4 I2C display. The circuit is designed to interface these components for various functionalities such as RFID reading, user input through a pushbutton, audio feedback via a buzzer, and visual output on an LCD display.

Component List

1. ESP32 (30 pin)

   • Description: A powerful microcontroller with built-in Wi-Fi and Bluetooth capabilities.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

2. RFID-RC522

   • Description: A low-cost RFID reader module that operates at 13.56 MHz.
   • Pins: VCC (3.3V), RST, GND, IRQ, MISO, MOSI, SCK, SDA

3. Pushbutton

   • Description: A simple pushbutton for user input.
   • Pins: Pin 2, Pin 1, Pin 3, Pin 4

4. Buzzer

   • Description: An audio signaling device.
   • Pins: PIN, GND

5. LCD 20x4 I2C

   • Description: A 20x4 character LCD display with I2C interface.
   • Pins: GND, 5v, SCA, SCL

Wiring Details

ESP32 (30 pin)

• GND is connected to:

  • GND of LCD 20x4 I2C
  • Pin 2 of Pushbutton
  • GND of Buzzer
  • GND of RFID-RC522

• Vin is connected to 5v of LCD 20x4 I2C

• D23 is connected to MOSI of RFID-RC522

• D22 is connected to SCL of LCD 20x4 I2C

• D21 is connected to SCA of LCD 20x4 I2C

• D19 is connected to MISO of RFID-RC522

• D18 is connected to SCK of RFID-RC522

• D5 is connected to SDA of RFID-RC522

• D4 is connected to RST of RFID-RC522

• D2 is connected to PIN of Buzzer

• D15 is connected to Pin 3 of Pushbutton

• 3V3 is connected to VCC (3.3V) of RFID-RC522

RFID-RC522

• VCC (3.3V) is connected to 3V3 of ESP32
• RST is connected to D4 of ESP32
• GND is connected to GND of ESP32
• MISO is connected to D19 of ESP32
• MOSI is connected to D23 of ESP32
• SCK is connected to D18 of ESP32
• SDA is connected to D5 of ESP32

Pushbutton

• Pin 2 is connected to GND of ESP32
• Pin 3 is connected to D15 of ESP32

Buzzer

• PIN is connected to D2 of ESP32
• GND is connected to GND of ESP32

LCD 20x4 I2C

• GND is connected to GND of ESP32
• 5v is connected to Vin of ESP32
• SCA is connected to D21 of ESP32
• SCL is connected to D22 of ESP32

Code

There is no code provided for this circuit.